[Devel] [PATCH VZ9 1/3] vhost-blk: don't allocate biovec for flush

[Pavel Tikhomirov]

There is no point in adding even one vector as we don't add any pages
to it. E.g. dispatch_rw_block_io(), blkdev_issue_flush() or
async_pmem_flush() where zero vectors are used for flush requests.

Fixes: 17bfe6e0400da ("drivers/vhost: vhost-blk accelerator for virtio-blk guests")
https://virtuozzo.atlassian.net/browse/VSTOR-94596
Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>

Feature: vhost-blk: in-kernel accelerator for virtio-blk guests
---
 drivers/vhost/blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/blk.c b/drivers/vhost/blk.c
index 9ef51335449f8..cd8d71c28bbd3 100644
--- a/drivers/vhost/blk.c
+++ b/drivers/vhost/blk.c
@@ -205,7 +205,7 @@ static int vhost_blk_bio_make_simple(struct vhost_blk_req *req,
 	req->pl = NULL;
 	req->bio = req->inline_bio;
 
-	bio = bio_alloc(bdev, 1, req->bi_opf, GFP_KERNEL);
+	bio = bio_alloc(bdev, 0, req->bi_opf, GFP_KERNEL);
 	if (!bio)
 		return -ENOMEM;
 
-- 
2.46.2